These three figures who stepped forward to battle the charging Shiik were Glorious Ranked Explorer, which was the next step after the Heroic Rank. At the Heroic Rank, the Explorer would have their center of power created linking them to their Ascendant Aura and their Mental Space could be accessed, and at the Glorious Rank, they could begin utilizing their Natal Treasure.
Natal Treasures were quite special, it was a weird result of the merger between a Mental Space and the mutated Auric energy of this realm. The Explorers in this world had no Mental Space but their souls contained Natal Treasures.
It could either be a weapon or a tool that was closely related to the nature of the Explorer. The Natal Treasurw would be born inside their Mental Space before the treasure absorbs the Mental Space creating a Glorious Ranked Explorer in the process, and their Ascension to the higher ranks depended on conquering new Natal Treasures and binding them to their mental Space.